<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<script>
    let a = 1
    let b = 2
    let c = "xx"
    let d = "yy"
    let e = "1"
    let b1 = false
    console.log(b1)
    //逻辑非
    console.log(!b1)
    //逻辑与  一假则假
    console.log(a<b && c < d)
    //逻辑或  一真则真
    console.log(a>b || c < d)
</script>
<body>

</body>
</html>